Syntheses, Properties, and Structures of Bis(trifluorovinyl) Tellurium Compounds

The reaction of AgC 2 F 3 , prepared from Me 3 SiC 2 F 3 and AgF, with elemental tellurium in propionitrile yields solutions of Te(C 2 F 3 ) 2 . Oxidations of these solutions with either xenon difluoride, elemental chlorine or bromine give the corresponding bis(trifluorovinyl)tellurium dihalides Te(C 2 F 3 ) 2 F 2 , Te(C 2 F 3 ) 2 Cl 2 and Te(C 2 F 3 ) 2 Br 2 in moderate yields. Ligand exchangebetween Te(C 2 F 3 ) 2 F 2 and trifluoroacetic acid anhydride yields Te(C 2 F 3 ) 2 (OCOCF 3 ) 2 . Further attempted exchange reactions resulted in complex mixtures. At –78 °C Te(C 2 F 3 ) 2 F 2 reacts with fluoride ions with formation of the ion [Te(C 2 F 3 ) 2 F 3 ] – , which decomposes already at –40 °C under formation of mainly [Te(C 2 F 3 )F 4 ] – and Te(C 2 F 3 ) 2 . The solid‐state structures of Te(C 2 F 3 ) 2 F 2 , Te(C 2 F 3 ) 2 Cl 2 , Te(C 2 F 3 ) 2 Br 2 and Te(C 2 F 3 ) 2 (OCOCF 3 ) 2 have been elucidated.